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arm64: cpufeature: Remove cpu_has_fwb() check

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cpu_has_fwb() is supposed to warn user is following architectural
requirement is not valid:

LoUU, bits [29:27] - Level of Unification Uniprocessor for the cache
                     hierarchy.

  Note

    When FEAT_S2FWB is implemented, the architecture requires that
    this field is zero so that no levels of data cache need to be
    cleaned in order to manage coherency with instruction fetches.

LoUIS, bits [23:21] - Level of Unification Inner Shareable for the
                      cache hierarchy.

  Note

    When FEAT_S2FWB is implemented, the architecture requires that
    this field is zero so that no levels of data cache need to be
    cleaned in order to manage coherency with instruction fetches.

It is not really clear what user have to do if assertion fires. Having
assertions about the CPU design like this inspire even more assertions
to be added and the kernel definitely is not the right place for that,
so let's remove cpu_has_fwb() altogether.

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Link: https://lore.kernel.org/r/20220224164739.119168-1-vladimir.murzin@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Vladimir Murzin
2022-02-24 16:47:39 +00:00
committed by Will Deacon
parent 16860a209c
commit 032e6c3379
1 changed files with 0 additions and 9 deletions
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9
arch/arm64/kernel/cpufeature.c
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@@ -1775,14 +1775,6 @@ static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused)
write_sysreg(read_sysreg(tpidr_el1), tpidr_el2);
}
static void cpu_has_fwb(const struct arm64_cpu_capabilities *__unused)
{
u64 val = read_sysreg_s(SYS_CLIDR_EL1);
/* Check that CLIDR_EL1.LOU{U,IS} are both 0 */
WARN_ON(CLIDR_LOUU(val) || CLIDR_LOUIS(val));
}
#ifdef CONFIG_ARM64_PAN
static void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused)
{
@@ -2144,7 +2136,6 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.field_pos = ID_AA64MMFR2_FWB_SHIFT,
.min_field_value = 1,
.matches = has_cpuid_feature,
.cpu_enable = cpu_has_fwb,
},
{
.desc = "ARMv8.4 Translation Table Level",